"Product name": crystal oscillator

"Product":3.579M3.6864M4M4.0964.194304M4.5M4.897M4.9152M5M5.5296M6M6.7458M7.3728M8M8.4672M9.81563M9.84304M9.84375M10M11.0592M12M12.288M13.2256M13.52127M13.56M14.7456M16M 16.9344M, and so on.
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Crystal Oscillator in electronic circuits are divided into passive two types of crystal oscillators and active crystal. English name passive Crystal Crystal (Crystal), while active Crystal is called the oscillator (oscillator). No source Crystal vibration is has 2 a introduction feet of electrodeless sex components, needs with Yu clock circuit to produced oscillation signal, itself cannot oscillation up, so "no source Crystal vibration" this claims does not accurate; has source Crystal vibration has 4 only introduction feet, is a full of oscillation device, which except quartz crystal outside, also has transistor and resistance capacity components, so volume larger.

主要参数 :

• The total frequency difference: in a specified period of time, due to the provisions of the working and non-working parameters are all caused by the combination of crystal oscillator frequency and the maximum deviation for a given nominal frequency.

• Frequency-temperature stability: at nominal power and load, without implicit reference temperature specified temperatures or maximum allowed with implicit reference temperature frequency deviation.

• Boot features (preheating time frequency stability): refers to boot after a period of time (for example, 5 minutes) frequency to boot another time (1 hour) the frequency rate of change, said the Crystal to achieve a steady rate.

• Frequency aging rate: measured at constant ambient conditions when the oscillator frequency, the oscillator frequency and time relationships. This long-term frequency drift is caused by the slow changing of the Crystal and oscillator components. Therefore, the rate of frequency shift in the rate of aging, the greatest rate of change after a fixed time (such as ± 10ppb/, power up after 72 hours) or maximum total frequency changes within a set time frame (such as: ± 1ppm/(first year) and ± 5ppm/(ten years)).

⒌ short stable: short-term stability.

• Frequency range voltage controlled: adjust the frequency control voltage from the voltage to the specified Terminal voltage, the minimum peak change of crystal oscillator frequency

⒎ the rate voltage-controlled linear: the ideal (linear) function-input control voltage output frequency transmission characteristics of a measure, expressed as a percentage of the entire range of frequency offset allows the nonlinearity.

Afghanistan has gone SSB phase noise £ (f): offset carrier f, a phase-modulation side-band power density and the ratio of carrier power.

引脚分布 :

• Square, using the DIP-8 package, RBI is 1 foot.

1-NC ; 4-GND; 5-Output; 8-VCC 。

Active Crystal model number, and each model have different pin definition, connection is different, here I introduce active Crystal pin identification, to help you: there is a dot notation is 1 foot, counterclockwise (pipe feet) respectively 2, 3, 4. Typical uses: one foot dangling two feet grounded, three-pin output, four-legged voltage.

Has source Crystal vibration is with quartz crystal composition of, quartz chip is can Dang for oscillation device using, is based on it of piezoelectric effect: in chip of two a very Shang plus a farm, will makes crystal produced mechanical deformation; in quartz chip Shang plus AC variable voltage, Crystal on will produced mechanical vibration, while mechanical deformation vibration and will produced alternating electric field, although this alternating electric field of voltage extremely weak, but its vibration frequency is is stable of. When the frequency of the applied alternating voltage and frequency at chip (determined by the chip size and shape) are equal, the amplitude of mechanical vibrations will increase dramatically, a phenomenon known as "piezoelectric resonator".

Piezoelectric resonator the establishing and maintaining of the State depends on the oscillator circuit can be achieved.

Quartz crystal oscillator frequency stability of up to 10^-9/, or even 10^-11. For example 10MHz oscillator, frequency in a day and typically not more than 0.1Hz. Therefore, the crystal oscillator can be regarded as a constant reference frequency sources (quartz watches, digital watches are quartz crystals to do the timing reference frequency). Born from the PC, the motherboard has been using a 14.318MHz quartz crystal oscillator reference frequency source. Apart from the 14.318MHz on the motherboard of the Crystal, and can still find a frequency of 32.768KHz Crystal, it is used in the real time clock (RTC) circuit, shows the exact time and date.